From an article in The New York Times:
I asked Dr. Sordillo how much people should really worry about swimming. She said, “I personally don’t let my children swim in public pools.”
I should add that Dr. Beach did emphasize that swimming was very good exercise.
“I hope,” he said, “that we don’t scare people off.”
On the other hand, if they are not somewhat scared, they won’t be careful – a difficult line to walk.